ENGLISH

Bifurcation analysis for the construction of a phase diagram of heteropolymer liquids

By Ivanova A.N. , Kuchanov S.I. , Manevitch L.I.

Book information

Year
2005
DOI
10.1063/1.1827323]
Language
english
Format
PDF
Filesize
183 kB (187598 bytes)
Pages
19\19
Library
mexmat
Time added
2009-07-20 03:45:11

Description

Rather general mean field theory of heteropolymer liquids developed earlier reducesthe problem of the phase diagram construction to the determination of extremalsof the free energy functional. These should be subsequently analyzed for theirlocal and global stability. Tackling of this problem traditionally involves the examinationof the behavior of the solutions of a set of nonlinear algebraic and partialdifferential equations at various values of the control parameters. Besides, the necessityarises here to construct in space of these parameters the lines where apolymer system loses the thermodynamic stability. To overcome mathematical difficultiesencountered we employed a complex approach that combines analyticaland numerical methods. A two-step procedure constitutes the essence of such anapproach. First, the bifurcation analysis is invoked to find the asymptotics of theextremals in the vicinity of bifurcation points. Then these asymptotics are used asan initial approximation for the numerical continuation of specific lines, where thestability loss occurs, into regions of the parametric space far removed from bifurcationvalues. We realized this approach for the melt of linear binary copolymers ofvarious chemical structure with macromolecules having a pattern of arrangement ofmonomeric units describable by a Markov chain. Bifurcation and phase diagramsfor some of these copolymers have been constructed within a wide range of temperaturesand volume fractions of a polymer

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